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Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow

In this paper we investigate the effects of an externally imposed axial mass flux (axial pressure gradient, axial through flow) on ferrofluidic Taylor-Couette flow under the influence of either an axial or a transverse magnetic field. Without an imposed axial through flow, due to the symmetry-conser...

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Autores principales: Altmeyer, Sebastian, Do, Younghae
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6817883/
https://www.ncbi.nlm.nih.gov/pubmed/31659226
http://dx.doi.org/10.1038/s41598-019-51935-x
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author Altmeyer, Sebastian
Do, Younghae
author_facet Altmeyer, Sebastian
Do, Younghae
author_sort Altmeyer, Sebastian
collection PubMed
description In this paper we investigate the effects of an externally imposed axial mass flux (axial pressure gradient, axial through flow) on ferrofluidic Taylor-Couette flow under the influence of either an axial or a transverse magnetic field. Without an imposed axial through flow, due to the symmetry-conserving axial field and the symmetry-breaking transverse field, it gives rise to various vortex flows in ferrofluidic Taylor-Couette flow such as wavy Taylor vortex flow (wTVF), wavy spiral vortex flow (wSPI) and wavy vortex flows ([Formula: see text] and [Formula: see text] ), which are typically produced by a nonlinear interaction of rotational, shear and magnetic instabilities. In addition, when an axial through flow is imposed to a ferrofluidic Taylor-Couette flow in the presence of either an axial or a transverse magnetic field, previously unknown new helical vortex structures are observed. In particular, we uncover ‘modulated Mixed-Cross-Spirals’ with a combination of at least three different dominant azimuthal wavenumbers. Emergence of such new flow states indicates richer but potentially more controllable dynamics in ferrofluidic flows, i.e., an imposed axial through flow will be a new controllable factor/parameter in applications of a ferrofluidic and magnetic flows flow.
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spelling pubmed-68178832019-11-01 Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow Altmeyer, Sebastian Do, Younghae Sci Rep Article In this paper we investigate the effects of an externally imposed axial mass flux (axial pressure gradient, axial through flow) on ferrofluidic Taylor-Couette flow under the influence of either an axial or a transverse magnetic field. Without an imposed axial through flow, due to the symmetry-conserving axial field and the symmetry-breaking transverse field, it gives rise to various vortex flows in ferrofluidic Taylor-Couette flow such as wavy Taylor vortex flow (wTVF), wavy spiral vortex flow (wSPI) and wavy vortex flows ([Formula: see text] and [Formula: see text] ), which are typically produced by a nonlinear interaction of rotational, shear and magnetic instabilities. In addition, when an axial through flow is imposed to a ferrofluidic Taylor-Couette flow in the presence of either an axial or a transverse magnetic field, previously unknown new helical vortex structures are observed. In particular, we uncover ‘modulated Mixed-Cross-Spirals’ with a combination of at least three different dominant azimuthal wavenumbers. Emergence of such new flow states indicates richer but potentially more controllable dynamics in ferrofluidic flows, i.e., an imposed axial through flow will be a new controllable factor/parameter in applications of a ferrofluidic and magnetic flows flow. Nature Publishing Group UK 2019-10-28 /pmc/articles/PMC6817883/ /pubmed/31659226 http://dx.doi.org/10.1038/s41598-019-51935-x Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Altmeyer, Sebastian
Do, Younghae
Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow
title Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow
title_full Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow
title_fullStr Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow
title_full_unstemmed Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow
title_short Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow
title_sort effects of an imposed axial flow on a ferrofluidic taylor-couette flow
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6817883/
https://www.ncbi.nlm.nih.gov/pubmed/31659226
http://dx.doi.org/10.1038/s41598-019-51935-x
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